Update repo url (kubernetes#17788)

service-catalog is not part of kubernetes-incubator anymore

content/en/docs/tasks/service-catalog/install-service-catalog-using-helm.md

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-Use [Helm](https://helm.sh/) to install Service Catalog on your Kubernetes cluster. Up to date information on this process can be found at the [kubernetes-incubator/service-catalog](https://github.com/kubernetes-incubator/service-catalog/blob/master/docs/install.md) repo.
+Use [Helm](https://helm.sh/) to install Service Catalog on your Kubernetes cluster. Up to date information on this process can be found at the [kubernetes-sigs/service-catalog](https://github.com/kubernetes-sigs/service-catalog/blob/master/docs/install.md) repo.
 
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@@ -103,6 +103,6 @@ helm install svc-cat/catalog \
 
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 * View [sample service brokers](https://github.com/openservicebrokerapi/servicebroker/blob/master/gettingStarted.md#sample-service-brokers).
-* Explore the [kubernetes-incubator/service-catalog](https://github.com/kubernetes-incubator/service-catalog) project.
+* Explore the [kubernetes-sigs/service-catalog](https://github.com/kubernetes-sigs/service-catalog) project.
 
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